Lillian Kimball, The structure of the English sentence (1900)
“ CHAPTER XIII THE ADVERBIAL CLAUSE OF CAUSEFunction.—In our daily experience we are continually meeting new conditions, discovering new truths. It is human nature to be curious as to the causes of these truths and conditions, hence there is no question perhaps which is asked oftener than the query of the scientist, the persistent question of the child, why? So common is this question that in our speech we anticipate its coming and answer it before it is asked. When we make statements of facts or of our opinions, we seem to foresee that we shall be asked why? ”
